Sometimes software comes pre-filled with default values and assuming they’re correct can create hidden bugs.
Why it matters:
Default data might be outdated, incorrect, or just placeholder values. Testing only the happy path with these values can give a false sense of security.
How to test:
- Change pre-filled fields before submitting forms.
- Test different user accounts and roles.
- Try unusual or edge-case inputs instead of defaults.
- Check calculated values or totals . Don’t assume they’re correct just because they look reasonable.
Real Example:
On an e-commerce demo site, the country field might default to “Australia.” If you don’t change it for other users, shipping calculations could be wrong.
Pro Tip:
Always verify and manipulate default values that’s where hidden bugs often hide.